Background: Children belong to 6-12 years need more attention and care for the physical development. Aim of the study to assess physical growth of school age children at Sohag Governorate. Subjects and method: A descriptive cross sectional research design was utilized. Four public (urban and rural) primary schools were included in the stud. Structure questionnaire was developed to assess personal characteristic of children, social class level. Weight and height percentiles for age were determined according to Egyptian growth charts. A total sample of 1000 children aged 6-12 years was participated in this study. Results: Nearly three quarters (74%) of children had moderate social level, while (14%) of them had low social class. Boys represented 52.4%. Height and weight were higher among urban boy''s children. The prevalence of underweight and short stature was higher in girls than boys in all age group except 10-